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Got a renalt laguna and car is hot but heater blowing cold air what do you do to fix it?
Wiki User
∙ 18y ago
The two hoses going into the firewall are for your heater core. Chances are the core is plugged if one hose is hot and the other is cold. If so, remove both hoses and attach two 3 ft 5/8" plastic see thru hoses on them ( $3) the pour in a container of cooling system flush ($4)into both hoses and let it work. Now take a garden hose and give each side a good blast and you should see all kinds of corrosion blast out. Now do it again. If this does not work, your core probably will need replacing. I hope this helps you. Mark
Wiki User
∙ 18y ago
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